CVE-2021-33044Known exploitationPublic exploitNetwork attack vector

Unauthenticated device sessions via NetKeyboard client type

Published Sep 15, 2021 · Updated Jan 12, 2026

Authentication bypass in Dahua IP cameras and related devices built before June 2021 allows remote attackers to obtain device sessions. During the global.login sequence over DHIP or HTTP(S), firmware accepts the client-supplied NetKeyboard type on devices that do not support that client and skips identity authentication. No credentials or user interaction are required; the resulting session grants unauthorized access to affected surveillance and intercom devices.

CVSS severity8.1
High
EPSS probability99.99%
Next 30 days · Nov 1, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Dahua IP cameras and related devices built before June 2021 allows remote attackers to obtain device sessions. During the global.login sequence over DHIP or HTTP(S), firmware accepts the client-supplied NetKeyboard type on devices that do not support that client and skips identity authentication. No credentials or user interaction are required; the resulting session grants unauthorized access to affected surveillance and intercom devices.

The record

CVE
CVE-2021-33044
Published
Sep 15, 2021
Updated
Jan 12, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Jan 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1Dahua PSIRTCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3Dahua PSIRTCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsShadowserver observations through Sep 28, 2026. Gaps indicate unavailable data.
Sep 22, 2026Sep 28, 2026
View daily counts
Reporting dayUnique IPs
Sep 22, 20268
Sep 23, 20262
Sep 24, 20267
Sep 25, 202612
Sep 26, 20264
Sep 27, 202613
Sep 28, 20267
Latest reporting daySep 28, 2026
Latest daily unique IPs7
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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